Multiple choice Treponema pallidum is a prokaryotic commensal eukaryotic parasite spirochete protozoan parasite mycoplasma Reveal answer Fill a bubble to check yourself C Correct answer Explanation Treponema pallidum is a spirochete because it is spiral shaped and moves with the help of axial filaments or endo-flagella. It is a prokaryote and a pathogenic spirochete - the causative agent of syphilis in human beings.